JP2004124475A - Joint section structure of highway bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent cracks from generating in the continuous pavement of the joint section structure of a highway bridge. <P>SOLUTION: Steps 10, 10 are formed in bridge bodies 1, 1 of both sides of an expansion space 2, and a flexible plate 8 made by laminating fiber reinforced asphalt 21 and a rubber material 22 so as to stride over the expansion space 2 is provided. A fixing tool 23 is driven in the flexible plate 8 and fixed to the flexible plate. Continuous pavements 12, 14 are formed on the flexible plate 8. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a blind bridge type road bridge joint structure.
[0002]
[Prior art]
The blind area type is mainly applied to a road bridge having a relatively small amount of expansion and contraction, and is known to absorb the expansion and contraction of the road bridge body by deformation of a continuously paved pavement material. Its basic structure is shown in FIG. That is, on both sides of the road bridge play space a, a step c is formed at the end of the road bridge body b, and the play a is filled with the joint material d, and the step material c is placed on the step c so as to cover the joint material d. An elastic compound e is cast, a waterproof sheet f is laid thereon, and a pavement g is provided thereon (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application No. 2002-6466
[Problems to be solved by the invention]
According to the blind spot type, since the pavement is continuous without interruption at the road bridge joint, the traveling performance of the vehicle is good, and the vibration and noise are reduced. However, since the elastic compound e is formed of a mixture of rubber, asphalt and crushed stone, it does not have much elasticity, cannot sufficiently absorb the expansion and contraction of the road bridge main body, and requires much time and labor for construction.
[0005]
Therefore, the present inventor has developed a construction method in which, instead of the elastic compound e, a preformed elastic plate-like molded body is erected on the steps c, c on both sides of the play, and paving is performed thereon. Such a plate-like molded body is preferably made of a material mainly composed of rubber so as to allow expansion and contraction of the road bridge main body. There is a problem in that the molded body is separated and moves with the expansion and contraction of the road bridge body. As a result, the molded article may be wrinkled, and the pavement may cause unevenness or cracks on the pavement. This crack extends in the longitudinal direction of the play (in the direction intersecting with the bridge axis), so that the traveling performance of the automobile is deteriorated. In addition, the pavement breaks from the cracked part due to the impact of passing through the car, and the cracked part gradually becomes large grooves, worsening the traveling performance, increasing noise and vibration, and impairing traveling safety. Come.
[0006]
It is an object of the present invention to suppress cracking and breakage of the pavement in such a blind spot type road bridge joint structure.
[0007]
[Means for Solving the Problems]
In order to solve such a problem, the present invention allows a plurality of locking members to penetrate through a flexible plate and be fixed to a road bridge main body or an abutment, so that the flexible plate is separated from a stepped portion even if it is displaced and moved. Was prevented.
[0008]
That is, the invention according to claim 1 is a blind-road type road bridge joint structure that is continuously paved so as to cover the gap of the road bridge joint,
A step portion lower than the upper surface of the road bridge body is formed on each of the road bridge bodies on both sides of the play, or on the road bridge body and the abutment on both sides of the play,
A flexible plate is provided so as to straddle the steps on both sides of the play,
The shaft portions of a plurality of locking tools having a shaft portion are fixed to the road bridge body or abutment through the flexible plate,
Continuous pavement is made on the flexible plate,
At the upper end of the shaft portion of the locking member, an engaging portion is provided for engaging the upper surface of the flexible plate so that the flexible plate does not float from the step portion,
The flexible plate is formed of a material mainly composed of rubber or asphalt so as to allow the expansion and contraction of the road bridge body to be absorbed and dispersed and to allow the through hole through which the shaft portion is deformed in the bridge axis direction. It is characterized by having been done.
[0009]
With such a road bridge joint structure, since the flexible plate is fixed to the stepped portion by a plurality of locking tools, even if the flexible plate is shifted with the expansion and contraction of the road bridge main body, the flexible plate is not moved. It is possible to prevent the flexible plate from peeling off from the step portion, and to prevent the flexible plate from being wrinkled. In addition, since the flexible plate is formed of a material mainly composed of elastic rubber or asphalt, the flexible plate can absorb and disperse the expansion and contraction of the road bridge main body and allow the flexible plate to absorb and disperse. Even if the locking tool is engaged, deformation of the through hole passing through the shaft of the locking tool in the bridge axis direction is acceptable. Further, it is preferable to configure the locking tool such that the engaging portion of the locking tool and the upper surface of the flexible plate are substantially flush.
[0010]
As a result, waviness and cracks on the pavement are eliminated and the flatness of the pavement is maintained without impairing the elasticity of the road bridge joint. Sex is maintained.
[0011]
According to a second aspect of the present invention, in the road bridge joint structure according to the first aspect,
The flexible plate is characterized in that a through hole having a diameter larger than that of the shaft portion for passing the shaft portion of the locking tool is formed.
[0012]
With such a road bridge joint structure, a gap is provided between the shaft portion of the locking member and the through hole through which the shaft portion is formed in the flexible plate. Displacement movement and deformation of the flexible plate due to reduction can be allowed.
[0013]
【The invention's effect】
As described above, according to the first aspect of the present invention, it is possible to prevent the flexible plate from being peeled or lifted upward while allowing the flexible plate to expand and contract, thereby eliminating the waving and cracking of the pavement. . As a result, the traveling performance of the automobile is improved, and vibration and noise are reduced, so that traveling safety is maintained.
[0014]
According to the second aspect of the present invention, the gap is provided between the shaft portion of the locking tool and the through hole through which the shaft portion is formed in the flexible plate, whereby the flexible plate is separated or lifted upward. , The displacement and deformation of the flexible plate due to the expansion and contraction of the play of the road bridge body can be allowed.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
<Embodiment>
This embodiment is shown in FIG. In FIG. 2, 1 is a road bridge main body, and 2 is a play space that allows the road bridge main body 1 to expand and contract. In the play 2, a play closing means 9 comprising a pair of vertical plates 3 and 3 and a sealing material 4 is provided. Notches 6 and 6 are formed in the road bridge main body 1 on both sides of the play space 2. A concrete portion 7 made of super-hard concrete or resin concrete for height adjustment is cast in the notch portion 6 to form a step 10 lower than the upper surface of the road bridge main body 1.
[0017]
A flexible plate 8 that is continuous in the bridge axis direction is provided on the play closing means 9 and the step portion 10, and the upper surface thereof is substantially flush with the upper surface of the road bridge main body 1. A first sheet 11 is provided on the upper surface of the road bridge main body 1 and on the flexible plate 8, and a base layer asphalt pavement 12 is formed thereon. A second sheet 13 is provided on the base asphalt pavement 12, and a surface asphalt pavement 14 is provided thereon.
[0018]
The vertical plates 3, 3 extend in the play longitudinal direction (direction intersecting with the bridge axis) and face each other, and the lower portions are inclined toward each other to become narrower. The vertical plate 3 is fixed to the concrete part 7 by an anchor 15. The anchor 15 intersects with a reinforcing bar 16 connecting the road bridge body 1 and the concrete portion 7 and a through bar 17 extending in the play longitudinal direction, and the crossing portion is welded. A seal material 4 is filled between the vertical plates 3.
[0019]
FIG. 3 shows a structure of the locking member 23 for fixing the flexible plate 8 to the step portion 10. As shown in FIG. 3, the locking member 23 is composed of a flat head bolt having a head portion (engaging portion) 24 and a shaft portion 25, and the tip of the shaft portion 25 is notched obliquely. It is preferable that the notch be cut obliquely at an angle of about 45 °.
[0020]
As shown in FIG. 4, the flexible plate 8 has a fiber-containing asphalt sheet 21 fixed to an upper surface of a rubber material 22, a rubber material 22 fixed to an upper surface of the fixed fiber-filled asphalt sheet 21, and a further fixed rubber material. The fiber-containing asphalt sheet 21 is fixed to the upper surface of the fiber 22, and the fiber-containing asphalt sheet 21 and the rubber material 22 are alternately laminated. The thickness of the fiber-containing asphalt sheet 21 is preferably about 2 mm, and the thickness of the rubber material is preferably about 4 mm. Further, instead of the fiber-containing asphalt sheet 21, a material mainly containing bitumen containing fibers or a synthetic resin may be used. At this time, the asphalt may be thicker than the rubber material.
[0021]
The flexible plate 8 is provided with a plurality of holes 26 for inserting the locking members 23 at intervals. The hole diameter of the hole 26 is larger than the outer diameter of the shaft portion 25 of the locking member 23, and when the shaft portion 25 passes through the hole 26, the hole 26 can be allowed to deform in the bridge axis direction. A gap is provided. The entry portion of the hole 26 has a countersunk shape so that the countersunk bolt of the head portion 24 of the locking member 23 does not protrude from the surface of the flexible plate 8. Thus, the surfaces of the head portion 24 and the flexible plate 8 are substantially flush.
[0022]
After the flexible plate 8 is temporarily placed on the step portion 10, a plurality of holes are cut in the concrete portion 7 based on the holes 26, and a fixing agent 27 is inserted into the holes. The fixing agent 27 is specifically one in which an epoxy resin and a curing agent are packed in a bag or a glass bottle, and the bag or the glass bottle is broken at a portion cut at 45 ° at the tip of the locking member 23 to cut the bag or the glass bottle. When the epoxy resin and the curing agent are agitated on the chipped surface, the epoxy resin and the curing agent are mixed and curing starts.
[0023]
The gap between the road bridge body 1 and the flexible plate 8 is filled with a rubber seal material or a rubber adhesive 28. The shaft portion 25 of the locking member 23 is passed through a plurality of holes 26 formed in the flexible plate 8, the head portion 24 of the locking member 23 is engaged with the flexible plate 8, and the shaft portion 25 is It is fixed by the fixing agent 27 inserted in the part 7. Here, the locking tool 23 does not need to be limited to the additional product of the flathead bolt, but may be any as long as it has a head portion and a shaft portion and can obtain the same effect as above.
[0024]
Therefore, with the above-described road bridge joint structure, peeling or floating of the flexible plate 8 can be prevented by the plurality of locking members 23, and a gap is formed between the hole 26 and the shaft portion 25. With the provision, even if the flexible plate 8 is fixed by the locking member 23, the displacement and deformation of the flexible plate due to the expansion and contraction of the road bridge main body can be allowed. The deformation other than the bridge axis direction and the deformation in the vertical direction can be absorbed and dispersed to allow the deformation.
[0025]
Further, even if the flexible plate 8 is displaced and moved in accordance with a change in expansion or contraction of the play, the influence provided to the base asphalt pavement 12 is mitigated by the gap provided between the hole 26 and the locking member 23. And the occurrence of cracks is prevented. Even if a crack occurs in the base asphalt pavement 12, the second sheet 13 prevents the surface asphalt pavement 14 from being cracked.
[0026]
Furthermore, even if minute cracks may occur on the pavements 12, 14, the two sheets 11, 13 and the flexible plate 8 are waterproof, so that water is prevented from leaking from the road into the play space 2.
[0027]
Next, a construction method will be described. First, cutouts 6 and 6 are formed at the ends of the road bridge bodies 1 and 1, a streak 16 is implanted in the road bridge body 1, and the play closing means 9 is fitted into the play 2. Then, the reinforcing bar 17 is arranged, and the intersections of the anchor 15, the connecting bar 16, and the reinforcing bar 17 are welded to each other. After that, a concrete part 7 is formed by casting ultra-rapid hardened concrete or resin concrete into the notched parts 6,6. The upper surface of the concrete portion 7, that is, the step portion 10 is adjusted so as to be lower than the upper surface of the road bridge main body 1 by the thickness of the flexible plate 8.
[0028]
Next, after applying a sealing material or an adhesive 29 to the upper surface of the play closing means 9 and the step portion 10, the flexible plate 8 is placed thereon. The gap between the road bridge body 1 and the flexible plate 8 is filled with a rubber seal material or a rubber adhesive 28. The locking member 23 is passed through a plurality of holes 26 formed in the flexible plate 8, the head portion 24 of the locking member 23 is engaged with the flexible plate 8, and the notch portion at the tip of the shaft portion 25 is formed. The fixing agent 27 inserted into the hole of the concrete portion 7 is pierced, and the epoxy resin and the curing agent of the fixing agent 27 are mixed and hardened by stirring at the cutout surface at the tip of the locking member 23, and the shaft portion is hardened. 25 is fixed to the concrete part 7. Next, the base sheet asphalt pavement 12 is constructed by laying the first sheet 11, and the surface asphalt pavement 14 is constructed by laying the second sheet 13 thereon.
[0029]
Although the present embodiment has a joint structure between the road bridge bodies, the present invention can of course be similarly applied to a joint between the road bridge body and the abutment.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a conventional road bridge joint structure.
FIG. 2 is a sectional view showing a road bridge joint structure according to the embodiment of the present invention.
FIG. 3 is a side view showing the structure of the locking device.
FIG. 4 is an enlarged cross-sectional view of the flexible plate according to the embodiment, partially omitted;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Road bridge main body 2 Play space 3 Vertical plate 4 Sealing material 6 Notch 7 Concrete part 8 Flexible plate 9 Play space closing means 10 Step 11 First sheet 12 Base asphalt pavement 13 Second sheet 14 Surface asphalt pavement 15 Anchor 16 Streaks 17 Through streaks 21 Fiber-filled asphalt sheet 22 Rubber material 23 Locking device 24 Head part 25 Shaft part 26 Hole 27 Fixing agent 28 Rubber sealing material or rubber adhesive 29 Sealing material or adhesive

Claims (2)

A blind-bridge type road bridge joint structure that is continuously paved so as to cover the gap of the road bridge joint,
A step portion lower than the upper surface of the road bridge body is formed on each of the road bridge bodies on both sides of the play, or on the road bridge body and the abutment on both sides of the play,
A flexible plate is provided so as to straddle the steps on both sides of the play,
The shaft portions of a plurality of locking tools having a shaft portion are fixed to the road bridge body or abutment through the flexible plate,
Continuous pavement is made on the flexible plate,
At the upper end of the shaft portion of the locking member, an engaging portion is provided for engaging the upper surface of the flexible plate so that the flexible plate does not float from the step portion,
The flexible plate is formed of a material mainly composed of rubber or asphalt so as to allow the expansion and contraction of the road bridge body to be absorbed and dispersed and to allow the through hole through which the shaft portion is deformed in the bridge axis direction. Road bridge joint structure characterized by being done. The road bridge joint structure according to claim 1,
A seam structure for a road bridge, characterized in that a through hole having a diameter larger than that of the shaft portion for passing the shaft portion of the locking tool is formed in the flexible plate.

Images